Rear wiper blowing fuse 28

[MattDanPug]

Driving to work tthis morning I had tthe battery light illuminate on the dash, didn't think much of it other than the altenator maybe, got to work left it until lunch. Got back to the car started it and it had gone out but then I realised I had to power to my clock/thermometer, front electric windows or rear wiper... it blew fuse 28 which is a 15amp fuse... why would this be? I disconnected the rear wiper and it's fine. Would this be the wiring to the wiper or the motor itself as that started to tick recently when settling into 'resting place' ...